Many years ago the US adopted a high velocity 6mm lee navy cartridge. Looks like the chinese have adopted something similar for their infantry carbines
Troops with latest Chinese assault carbine
The ballistics of the 6mm lee navy are not so different. The lee seems to have been a little larger in diameter.
Bullet diameter 0.244 (0.236 dia. before rifling)
112gr (7.3g) (military loading) 2,560 ft/s (780 m/s) 1,629 ft⋅lbf (2,209 J)
Troops with latest Chinese assault carbine
The standard loading features a 64-grain FMJBT projectile with a 22.6-grain AP core loaded into a copper washed steel case. The overall cartridge length is 58mm, case length is 42.2mm, and the projectile is 24.2mm long. The cartridge case somewhat resembles the Russian 5.45x39 in that it is tapered; however, the case neck is shorter. It bears no outward resemblance to the 5.56x45. While straightwall cases like the 5.56 are inherently more accurate, tapered cases aid feeding and extraction. The projectile also exhibits a substantial sectional density, although not as great as that of the 5.45x39. Muzzle velocity from the Type 95’s 18.2-inch barrel is 3,050 fps. Out of the Type 95 Squad Auto’s 21.9-inch barrel it clocks 3,182 fps. The Chinese have tested their new cartridge extensively against both the 5.56x45 SS109 and the Russian 5.45x39 7N6. They claim their 5.8x42mm outperforms both cartridges with penetration superior to the SS109, a flatter trajectory, and a higher retained velocity and energy downrange. http://www.smallarmsreview.com/display.article.cfm?idarticles=2321
The ballistics of the 6mm lee navy are not so different. The lee seems to have been a little larger in diameter.
Bullet diameter 0.244 (0.236 dia. before rifling)
112gr (7.3g) (military loading) 2,560 ft/s (780 m/s) 1,629 ft⋅lbf (2,209 J)
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